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cpp2ffi: don't let the generated-header test link

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The test at the end of cimgui_generation passes neither -c nor -E, so gcc
compiles the .h into a precompiled header and then still tries to link,
failing with "undefined reference to `main'" whenever the toolchain puts
something link-ish on the command line (a -Wl,... or -L from a spec file or
a compiler wrapper). That aborts generation via the assert in get_cdefs.

-fsyntax-only is all this check needs, since only the diagnostics are
inspected and the get_cdefs return value is discarded. -x c is needed too,
without it gcc 5 stays in precompiled-header mode and fails with "output
filename specified twice".
This commit is contained in:
JamesWrigley
2026-08-20 16:49:23 +02:00
parent 91ea8b056f
commit 0fe23bd335
1 changed files with 1 additions and 1 deletions
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generator/cpp2ffi.lua
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@@ -3476,7 +3476,7 @@ function M.Parser()
if COMPILER=="gcc" then
local include_cmd = COMPILER=="cl" and [[ /I ]] or [[ -I ]]
local extra_includes = include_cmd.." ../../cimgui "
local CPRE = COMPILER..[[ -std=c99 -DCIMGUI_DEFINE_ENUMS_AND_STRUCTS -DIMGUI_ENABLE_FREETYPE ]] ..extra_includes.. "./output/"..name..".h"
local CPRE = COMPILER..[[ -fsyntax-only -x c -std=c99 -DCIMGUI_DEFINE_ENUMS_AND_STRUCTS -DIMGUI_ENABLE_FREETYPE ]] ..extra_includes.. "./output/"..name..".h"
print(CPRE)
get_cdefs(CPRE,"name")
end