Re: Undefined __aeabi_uidivmod in 14.0 armv7

On Nov 23, 2023, at 13:23, Robert Clausecker <[email protected]> wrote:
> 
> Hi John,
> 
> This is a long standing open issue in base.  These __aeabi symbols are
> shims used by the ARM EABI to implement functionality missing in the
> instruction set.  Back when this was implemented, whoever did the port
> hacked something up and only added those symbols that were initially
> needed.  However, turns out a bunch more will be used by gcc/clang
> under certain circumstances.
> 
> While we actually have code for all of these symbols in clang's runtime,
> the version scripts were never fixed and the symbols remain unexposed.
> I have previously raised this issue with a bunch of people involved in
> the ARM bits of FreeBSD but never managed to get anybody to fix it.
> 
> Maybe it'll be different this time.
> 
> If you want to give it a try yourself, check the ARM EABI document.  It
> has a list of all __aeabi symbols that should be present.  You could try
> and add the missing ones to the appropriate libraries.
> 
> Yours,
> Robert Clausecker

This solves my build problem.  I made up a version string and
assumed all the __aeabi_ symbols in libgcc.a were to be exported.
I omitted the string functions as suggested in bug 271087.

diff --git a/lib/libgcc_s/Versions.def b/lib/libgcc_s/Versions.def
index d28e9042f744..b90bc705e3de 100644
--- a/lib/libgcc_s/Versions.def
+++ b/lib/libgcc_s/Versions.def
@@ -31,3 +31,6 @@ GCC_4.3.0 {
 
 GCC_4.6.0 {
 } GCC_4.3.0;
+
+EABI_1 {
+};
diff --git a/lib/libgcc_s/arm/Symbol.map b/lib/libgcc_s/arm/Symbol.map
index 92b54761d810..49b0820b2a73 100644
--- a/lib/libgcc_s/arm/Symbol.map
+++ b/lib/libgcc_s/arm/Symbol.map
@@ -15,3 +15,30 @@ GCC_3.5 {
 GCC_4.3.0 {
 	_Unwind_Backtrace;
 };
+
+EABI_1 {
+	__aeabi_llsl;
+	__aeabi_lasr;
+	__aeabi_lcmp;
+	__aeabi_idiv;
+	__aeabi_h2f;
+	__aeabi_d2lz;
+	__aeabi_f2lz;
+	__aeabi_d2ulz;
+	__aeabi_f2ulz;
+	__aeabi_ui2d;
+	__aeabi_ui2f;
+	__aeabi_llsr;
+	__aeabi_lmul;
+	__aeabi_d2h;
+	__aeabi_f2h;
+	__aeabi_ulcmp;
+	__aeabi_uidiv;
+	__aeabi_l2d;
+	__aeabi_l2f;
+	__aeabi_ul2d;
+	__aeabi_ul2f;
+	__aeabi_idiv0;
+	__aeabi_ldivmod;
+	__aeabi_uidivmod;
+};