Print compile/link logs to stderr (KhronosGroup#4138)

When glslang is integrated into a build system (like Meson), stdout
is stored in an output file and stderr is printed to the user. This
hides error messages from the user. See:
mesonbuild/meson#11506

stderr is the standard stream errors should get printed to, always
use that.

Author: emersion

StandAlone/StandAlone.cpp

@@ -1523,9 +1523,9 @@ void CompileAndLinkShaderUnits(std::vector<ShaderCompUnit> compUnits)
         if (! (Options & EOptionSuppressInfolog) &&
             ! (Options & EOptionMemoryLeakMode)) {
             if (!beQuiet)
-                PutsIfNonEmpty(compUnit.fileName[0].c_str());
-            PutsIfNonEmpty(shader->getInfoLog());
-            PutsIfNonEmpty(shader->getInfoDebugLog());
+                StderrIfNonEmpty(compUnit.fileName[0].c_str());
+            StderrIfNonEmpty(shader->getInfoLog());
+            StderrIfNonEmpty(shader->getInfoDebugLog());
         }
     }
 
@@ -1546,8 +1546,8 @@ void CompileAndLinkShaderUnits(std::vector<ShaderCompUnit> compUnits)
 
         // Report
         if (!(Options & EOptionSuppressInfolog) && !(Options & EOptionMemoryLeakMode)) {
-            PutsIfNonEmpty(program.getInfoLog());
-            PutsIfNonEmpty(program.getInfoDebugLog());
+            StderrIfNonEmpty(program.getInfoLog());
+            StderrIfNonEmpty(program.getInfoDebugLog());
         }
 
         // Reflect

Test/runtests

@@ -17,7 +17,7 @@ if [ -d "${LIBPATH}" ]; then
 fi
 
 function run {
-    "$EXE" "$@"
+    "$EXE" "$@" 2>&1
     result=$?
     case "$result" in
     [0-6]) # Valid success and error codes