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cmake: For gcc8 use linker to find paths to libc, libm, libstdc++, etc

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Removes the need to know/guess the paths to these libraries. Once we are gcc 8 only, we
can remove -nostdlib and no additional arguments are needed for system libraries.

The catch is: any time IDF overrides a symbol in the toolchain sysroot, we need
an undefined linker marker to make sure this symbol is seen by linker.
This commit is contained in:
Angus Gratton
2019-04-15 13:45:08 +10:00
committed by Renz Christian Bagaporo
parent 2c12080049
commit 22514c1dd9
13 changed files with 83 additions and 41 deletions
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components/esp32/ld/esp32.project.ld.in
+5 -5
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@@ -267,12 +267,12 @@ SECTIONS
__eh_frame = ABSOLUTE(.);
KEEP(*(.eh_frame))
. = (. + 7) & ~ 3;
/* C++ constructor and destructor tables, properly ordered: */
/* C++ constructor and destructor tables
Make a point of not including anything from crtbegin.o or crtend.o, as IDF doesn't use toolchain crt
*/
__init_array_start = ABSOLUTE(.);
KEEP (*crtbegin.*(.ctors))
KEEP (*(EXCLUDE_FILE (*crtend.*) .ctors))
KEEP (*(SORT(.ctors.*)))
KEEP (*(.ctors))
KEEP (*(EXCLUDE_FILE (*crtend.* *crtbegin.*) .ctors .ctors.*))
__init_array_end = ABSOLUTE(.);
KEEP (*crtbegin.*(.dtors))
KEEP (*(EXCLUDE_FILE (*crtend.*) .dtors))