[Bug c++/100462] g++ fails to find a generated pre-compiled header

[mail at 3v1n0 dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100462

--- Comment #3 from Marco Trevisan <mail at 3v1n0 dot net> ---
Created attachment 50775
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50775&action=edit
strace.log

This is crazy, as even according to strace the file isn't there...

But it is and it's valid.
❯ ls -lht _build/libgjs-jsapi.a.p 
total 119M
-rw-rw-r-- 1 marco marco 119M mag  7 16:20 gjs_pch.hh.gch


[pid 1168435] openat(AT_FDCWD, "./gjs_pch.hh", O_RDONLY|O_NOCTTY) = -1 ENOENT
(No such file or directory)
[pid 1168435] openat(AT_FDCWD, "libgjs.so.0.0.0.p/gjs_pch.hh",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)
[pid 1168435] openat(AT_FDCWD, "../gjs_pch.hh", O_RDONLY|O_NOCTTY) = -1 ENOENT
(No such file or directory)
[pid 1168435] openat(AT_FDCWD, "/opt/dev/GNOME/include/glib-2.0/gjs_pch.hh",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)
[pid 1168435] openat(AT_FDCWD,
"/opt/dev/GNOME/lib/glib-2.0/include/gjs_pch.hh", O_RDONLY|O_NOCTTY) = -1
ENOENT (No such file or directory)
[pid 1168435] openat(AT_FDCWD,
"/opt/dev/GNOME/include/gobject-introspection-1.0/gjs_pch.hh",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)
[pid 1168435] openat(AT_FDCWD, "/opt/dev/GNOME/include/pixman-1/gjs_pch.hh",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)


Same is also running manually (with CWD in _build directory):

strace -f g++ -v -Ilibgjs-jsapi.a.p -I. -I.. -I/opt/dev/GNOME/include/glib-2.0
-I/opt/dev/GNOME/lib/glib-2.0/include
-I/opt/dev/GNOME/include/gobject-introspection-1.0
-I/opt/dev/GNOME/include/pixman-1 -I/usr/include/cairo -I/usr/include/uuid
-I/usr/include/freetype2 -I/usr/include/libpng16 -fdiagnostics-color=always
-pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -Wextra
-std=c++17 -fno-rtti -g -fno-strict-aliasing -Wno-variadic-macros
-Wno-missing-field-initializers -fno-semantic-interposition -fPIC -pthread
-isystem/opt/dev/GNOME/include/sysprof-4 -include
/usr/include/mozjs-78/js/RequiredDefines.h -isystem /usr/include/mozjs-78
-DGJS_COMPILATION '-DGJS_JS_DIR="/usr/local/share/gjs-1.0"'
'-DPKGLIBDIR="/usr/local/lib/x86_64-linux-gnu/gjs"' '-DG_LOG_DOMAIN="Gjs"'
-fpch-preprocess -include gjs_pch.hh -MD -MQ
libgjs-jsapi.a.p/gjs_jsapi-dynamic-class.cpp.o -MF
libgjs-jsapi.a.p/gjs_jsapi-dynamic-class.cpp.o.d -o
libgjs-jsapi.a.p/gjs_jsapi-dynamic-class.cpp.o -c
../gjs/jsapi-dynamic-class.cpp