patch 8.2.0541: Travis CI does not give compiler warnings

Problem:    Travis CI does not give compiler warnings.
Solution:   Add flags for warnings.  Fix uncovered problems. (Ozaki Kiichi,
            closes #5898)

.travis.yml

@@ -3,7 +3,7 @@ language: c
 _anchors:
   envs:
     - &tiny-nogui
-      BUILD=yes TEST=test FEATURES=tiny "CONFOPT='--disable-gui'" SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
+      BUILD=yes TEST=test FEATURES=tiny CONFOPT="--disable-gui" SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
     - &tiny
       BUILD=yes TEST=test FEATURES=tiny CONFOPT= SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
     - &small
@@ -12,10 +12,10 @@ _anchors:
       BUILD=yes TEST=test FEATURES=normal CONFOPT= SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
     - &linux-huge
       BUILD=yes TEST="scripttests test_libvterm" CFLAGS=--coverage LDFLAGS=--coverage FEATURES=huge SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
-      "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-python3interp --enable-rubyinterp --enable-luainterp --enable-tclinterp'"
+      CONFOPT="--enable-perlinterp --enable-pythoninterp --enable-python3interp --enable-rubyinterp --enable-luainterp --enable-tclinterp"
     - &osx-huge # macOS build
       BUILD=yes TEST=test FEATURES=huge SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
-      "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp --enable-tclinterp'"
+      CONFOPT="--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp --enable-tclinterp"
     - &unittests
       BUILD=no TEST=unittests CFLAGS=--coverage LDFLAGS=--coverage FEATURES=huge SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=yes
     - &asan # ASAN build
@@ -124,6 +124,10 @@ script:
   - echo -e "\\033[33;1mBuilding Vim\\033[0m" && echo -en "travis_fold:start:build\\r\\033[0K"
   - |
     if [[ "${BUILD}" = "yes" ]]; then
+      # Append various warning flags to CFLAGS.
+      # BSD sed needs backup extension specified.
+      sed -i.bak -f ci/config.mk.sed ${SRCDIR}/auto/config.mk
+      sed -i.bak -f ci/config.mk.${CC}.sed ${SRCDIR}/auto/config.mk
       make ${SHADOWOPT} -j${NPROC}
     fi
   - echo -en "travis_fold:end:build\\r\\033[0K"
@@ -215,11 +219,6 @@ jobs:
       compiler: gcc
       env: *linux-huge
       after_success: *coverage
-    - <<: *linux
-      name: unittests+coverage/gcc
-      compiler: gcc
-      env: *unittests
-      after_success: *coverage
     - <<: *linux # ASAN
       name: huge+asan/gcc
       compiler: gcc
@@ -234,6 +233,11 @@ jobs:
         - *linux-huge
         - TEST="-C src testgui"
       after_success: *coverage
+    - <<: *linux
+      name: unittests+coverage/gcc
+      compiler: gcc
+      env: *unittests
+      after_success: *coverage
     - <<: *linux
       name: vimtags/gcc
       compiler: gcc

ci/config.mk.clang.sed

@@ -0,0 +1 @@
+/^RUBY_CFLAGS\b/s/$/ -Wno-error=unknown-attributes -Wno-error=ignored-attributes/

ci/config.mk.gcc.sed

@@ -0,0 +1 @@
+/^CFLAGS\b/s/$/ -Wno-error=maybe-uninitialized/

ci/config.mk.sed

@@ -0,0 +1,2 @@
+/^CFLAGS\b/s/$/ -Wall -Wextra -Wshadow -Werror/
+/^PERL_CFLAGS\b/s/$/ -Wno-error=unused-function/

src/if_perl.xs

@@ -195,7 +195,9 @@ typedef int perl_key;
 #  define Perl_croak_xs_usage dll_Perl_croak_xs_usage
 # endif
 # ifndef PROTO
-#  define Perl_croak_nocontext dll_Perl_croak_nocontext
+#  ifdef PERL_IMPLICIT_CONTEXT
+#   define Perl_croak_nocontext dll_Perl_croak_nocontext
+#  endif
 #  define Perl_call_argv dll_Perl_call_argv
 #  define Perl_call_pv dll_Perl_call_pv
 #  define Perl_eval_sv dll_Perl_eval_sv
@@ -345,7 +347,9 @@ static void (*Perl_croak_xs_usage)(pTHX_ const CV *const, const char *const para
 						    __attribute__noreturn__;
 #  endif
 # endif
+# ifdef PERL_IMPLICIT_CONTEXT
 static void (*Perl_croak_nocontext)(const char*, ...) __attribute__noreturn__;
+# endif
 static I32 (*Perl_dowantarray)(pTHX);
 static void (*Perl_free_tmps)(pTHX);
 static HV* (*Perl_gv_stashpv)(pTHX_ const char*, I32);

src/if_ruby.c

@@ -99,6 +99,12 @@
 # define rb_ary_detransient rb_ary_detransient_stub
 #endif
 
+// On macOS pre-installed Ruby defines "SIZEOF_TIME_T" as "SIZEOF_LONG" so it
+// conflicts with the definition in config.h then causes macro-redifned warning.
+#ifdef SIZEOF_TIME_T
+# undef SIZEOF_TIME_T
+#endif
+
 #include <ruby.h>
 #if RUBY_VERSION >= 19
 # include <ruby/encoding.h>

src/libvterm/t/harness.c

@@ -67,7 +67,8 @@ static VTermEncodingInstance encoding;
 
 static int parser_text(const char bytes[], size_t len, void *user)
 {
-  int i;
+  size_t i;
+  (void)user;
 
   printf("text ");
   for(i = 0; i < len; i++) {
@@ -83,6 +84,7 @@ static int parser_text(const char bytes[], size_t len, void *user)
 
 static int parser_control(unsigned char control, void *user)
 {
+  (void)user;
   printf("control %02x\n", control);
 
   return 1;
@@ -90,7 +92,8 @@ static int parser_control(unsigned char control, void *user)
 
 static int parser_escape(const char bytes[], size_t len, void *user)
 {
-  int i;
+  size_t i;
+  (void)user;
 
   if(bytes[0] >= 0x20 && bytes[0] < 0x30) {
     if(len < 2)
@@ -112,6 +115,7 @@ static int parser_escape(const char bytes[], size_t len, void *user)
 static int parser_csi(const char *leader, const long args[], int argcount, const char *intermed, char command, void *user)
 {
   int i;
+  (void)user;
   printf("csi %02x", command);
 
   if(leader && leader[0]) {
@@ -142,7 +146,9 @@ static int parser_csi(const char *leader, const long args[], int argcount, const
 
 static int parser_osc(const char *command, size_t cmdlen, void *user)
 {
-  int i;
+  size_t i;
+  (void)user;
+
   printf("osc ");
   for(i = 0; i < cmdlen; i++)
     printf("%02x", command[i]);
@@ -153,7 +159,9 @@ static int parser_osc(const char *command, size_t cmdlen, void *user)
 
 static int parser_dcs(const char *command, size_t cmdlen, void *user)
 {
-  int i;
+  size_t i;
+  (void)user;
+
   printf("dcs ");
   for(i = 0; i < cmdlen; i++)
     printf("%02x", command[i]);
@@ -178,6 +186,7 @@ static int want_movecursor = 0;
 static VTermPos state_pos;
 static int movecursor(VTermPos pos, VTermPos oldpos, int visible, void *user)
 {
+  (void)oldpos, (void)visible, (void)user;
   state_pos = pos;
 
   if(want_movecursor)
@@ -189,6 +198,7 @@ static int movecursor(VTermPos pos, VTermPos oldpos, int visible, void *user)
 static int want_scrollrect = 0;
 static int scrollrect(VTermRect rect, int downward, int rightward, void *user)
 {
+  (void)user;
   if(!want_scrollrect)
     return 0;
 
@@ -202,6 +212,7 @@ static int scrollrect(VTermRect rect, int downward, int rightward, void *user)
 static int want_moverect = 0;
 static int moverect(VTermRect dest, VTermRect src, void *user)
 {
+  (void)user;
   if(!want_moverect)
     return 0;
 
@@ -215,6 +226,7 @@ static int moverect(VTermRect dest, VTermRect src, void *user)
 static int want_settermprop = 0;
 static int settermprop(VTermProp prop, VTermValue *val, void *user)
 {
+  (void)user;
   VTermValueType type;
   if(!want_settermprop)
     return 1;
@@ -247,6 +259,7 @@ static int want_state_putglyph = 0;
 static int state_putglyph(VTermGlyphInfo *info, VTermPos pos, void *user)
 {
   int i;
+  (void)user;
   if(!want_state_putglyph)
     return 1;
 
@@ -268,6 +281,7 @@ static int state_putglyph(VTermGlyphInfo *info, VTermPos pos, void *user)
 static int want_state_erase = 0;
 static int state_erase(VTermRect rect, int selective, void *user)
 {
+  (void)user;
   if(!want_state_erase)
     return 1;
 
@@ -291,6 +305,7 @@ static struct {
 } state_pen;
 static int state_setpenattr(VTermAttr attr, VTermValue *val, void *user)
 {
+  (void)user;
   switch(attr) {
   case VTERM_ATTR_BOLD:
     state_pen.bold = val->boolean;
@@ -329,6 +344,7 @@ static int state_setpenattr(VTermAttr attr, VTermValue *val, void *user)
 
 static int state_setlineinfo(int row, const VTermLineInfo *newinfo, const VTermLineInfo *oldinfo, void *user)
 {
+  (void)row, (void)newinfo, (void)oldinfo, (void)user;
   return 1;
 }
 
@@ -350,6 +366,7 @@ static int want_screen_damage = 0;
 static int want_screen_damage_cells = 0;
 static int screen_damage(VTermRect rect, void *user)
 {
+  (void)user;
   if(!want_screen_damage)
     return 1;
 
@@ -404,6 +421,7 @@ static int screen_sb_pushline(int cols, const VTermScreenCell *cells, void *user
 {
   int eol;
   int c;
+  (void)user;
 
   if(!want_screen_scrollback)
     return 1;
@@ -423,6 +441,7 @@ static int screen_sb_pushline(int cols, const VTermScreenCell *cells, void *user
 static int screen_sb_popline(int cols, VTermScreenCell *cells, void *user)
 {
   int col;
+  (void)user;
 
   if(!want_screen_scrollback)
     return 0;
@@ -456,6 +475,7 @@ int main(int argc, char **argv)
 {
   char line[1024] = {0};
   int flag;
+  (void)argc, (void)argv;
 
   int err;
 
@@ -926,7 +946,7 @@ int main(int argc, char **argv)
 
     outlen = vterm_output_get_buffer_current(vt);
     if(outlen > 0) {
-      int i;
+      size_t i;
       char outbuff[1024];
       vterm_output_read(vt, outbuff, outlen);
 

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    541,
 /**/
     540,
 /**/